Wozniacki said Yastremska had used this tactic in the past as well in a bid to break her rhythm and she was expecting it too.
Yastremska took a medical timeout and had her left thigh taped while down 5-4 in the second set but Wozniacki did not let her focus waver.
Caroline Wozniacki refused to be rushed into retirement on Wednesday as the former world number one fought back from 5-1 down in the first set to beat Ukraine's Dayana Yastremska 7-5 7-5 in the second round of the Australian Open.
She said she will leave the game with lifelong friendships, not least best buddy Serena Williams, and encouraged the new women on the block to keep the locker room civil. After going down 1-5, she didn't just start getting more balls back, she also started doing different things with the ball, forcing Yastremska to put a little more thought into her play. So that's a trick that she's done before, and I knew that it was coming.
"I took [the timeout] because I felt I needed it", Yastremska said.
At the end of the match, Caroline scored 89 points vs. the Ukrainian's 77 points.
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Yastremska was in control before former world number one Wozniacki reeled off six successive games to steal the set on Margaret Court Arena.
"I was just thinking to myself, 'It surely can't continue". She did play some breathtakingly fearless tennis to save three match points at 4-5, and two more at 5-6, but you could sense that she was running out of time. She said that locker-room friendships can last through life. But Yastremska is just 19 years old, and in those crunch moments, she showed her age. Bertens won the match 6-4, 1-6, 6-3. How cool would it be for Wozniacki's last professional match to be against the GOAT, who also happens to be a good friend of hers?
Caroline Wozniacki had tears in her eyes as she kept alive her dreams of a triumphant farewell to tennis at the Australian Open yesterday.
"It's a little bit emotional for me", said Wozniacki, the 2018 Australian Open victor who announced in December that this would be her final tournament.
Wozniacki, who is slated to call a time on her career at the end of the Slam, will next face Ons Jabeur of Tunisia in the third round on Friday.